单项选择题

A．They almost arrive late.
B．They seldom bring any good news.
C．They are out of date.
D．They can’t take any useful message.
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填空题
One is that public transit does do a great deal to really make the urban______.
单项选择题
A．To see what would happen if the plane exploded in the water.B．To see how much air passengers need to breathe at certain altitudes.C．To find out if there are any weak parts that would burst under pressure.D．To find out how much air can be pumped into a plane.
A．To see what would happen if the plane exploded in the water.
B．To see how much air passengers need to breathe at certain altitudes.
C．To find out if there are any weak parts that would burst under pressure.
D．To find out how much air can be pumped into a plane.
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